Improvement in sewing-machine motors



I C. F. GREER. improvement in Sewing Machine Motors No. 124,812.PatentedMarchl9,1872.

UNITED STATES PATENT OEErcE;

CHAUNOEY F. GREER, OF GEORGETOWN, ASSIGNOR To LORENZO THOMAS,

- OF WASHINGTON, DISTRICT OE COLUMBIA.

ill/IPROVEMENT IN SEWlNG-MACHINE MOTORS.

Specification forming part of Letters Patent No. 124,812, dated March19, 1872.

To all whom it may concern:

Be it known that I, CHAUNOEY F. GREER, of Georgetown, District ofColumbia, have invented a certain new and useful Improved construction,and arrangement of the mechanism employed, and also in combiningtherewith a fanning attachment; and I do hereby declare that thefollowing specification, taken in connection with the drawing furnishedand forming a part of the same, is a clear, true, and exact descriptionthereof. I

Referring to the drawing, Figure 1 represents one of my spring-motors inperspective as if attached to the under side of a sewing-machine table,and with a portion of the case removed for the purpose of exhibiting theinterior. Fig. 2 represents the same viewed from below. Fig. 3represents the salneviewed from above, when detached from the table.

The same letters of reference are used in all the figures.

Arepresents the main or driving shaft. At each end the springsB aresecured, in a manner well known. By having two springs, and locatingthem at opposite ends of the shaft, their force is exerted evenly andtruly without any twisting strain of the shaft in its bearings. Thesprings are wound up in the usual manner by a crank on the end of. themain shaft, or a crank and pinion engaging with a gear mounted on themain shaft. 0 is the main driving-- gear wheel, mounted on the shaft A.It communicates with a small pinion, D, which is mounted on a shortcounter-shaft, E, and attached to alarger gear-wheel, F, which engageswith a second pinion, G, mounted upon a second short counter-shaft, H,to which is attached another gear-wheel, I, which engages with a thirdpinion, K, mounted on a power-shaft, L, to which is attached abalance-wheel, N, beltpulley N, and spiral-gear O. From the beltpulley Nthe power is taken upward to drive the sewing-machine. The spiral-gear 0engages with a worm, P, on the vertical regulatorshaft Q, to the lowerend of whichare four arms, a, provided with fan-shaped ends, which arecapable of being turned so as to present I their faces at any angledesired, and, by meetin g with much or little resistance from the air,will allow the apparatus to operate-at a low or high rate of speed. Ahook-brake, R, is arranged to engage with the power-shaft L. It isoperated by a slotted, hinged, or pivoted wedge, c, which, by enteringbetween the end of the casing or table and the button-tip d on the endof the brake-rod, causes the hook to engage with the shaft with more orless force as the wedge is entered or withdrawn.

In order to provide a means for promptly reducing the speed and givingthe operator perfect control of the motor, a V-shaped springbrake, S, isarranged to embrace with pressure the two sides of the balance-wheelnear its periphery. It is controlled by a pivoted wedge, T, which bybeing turned so as to enter between the two arms of the spring-brakewill force them apart and prevent their contact with the wheel. Byadjusting this wedge the degree of friction can be graduated as desiredand the motor brought under perfect control.

W is the fanning device, which is mounted on a vertical spring-arm, andmade to vibrate by the intermittent cont-act therewith of a cam on theside of the gear-wheel I. In a heated room, or during the summer season,this device will contribute largely to the comfort of th operative. v

The prominent features of my improved motor consist in mounting the twosprings on opposite ends of the main shaft, by which they can exerttheir power on the shaft without twisting it in its bearings in makingthe counter-shafting shorter than the main and power shaft-s, so as toadmit of the longitudinal side space in which to operate alargebalance-wheel or belt-pulley; in having the mechanism all located withina casin g and protected from injury and the entrance of dust; in havingthe shafting all set on the same plane, so that the device will operateone side up as well as the other, and thus provide for its attachment toany sewing-machine, regardless of the direc tion in which it is intendedto run.

It is not claimed that these several features, separately considered,are of my own, invention; but no sewing-machine motor has ever beforebeen constructed, to my knowledge, embodying the whole and, therefore,possessing, in

itself, the combined advantages accruing th er'erom.

The manner of operating the brake of a sewing-machine motor, asexhibited in my slotted wedge c, operatin g at the end of the hook-brakerod R, presents a simple, effective, and inexpensive means for stoppingthe device, while theV- shaped spring-brake S, operated by its pivotedwedge T, gives a more perfect control over the speed of the motor thanany other deviceknown to me.

Having thus described my invention, I claim as new and desire to secureby Letters Paten t- 1. The improved sewing-machine motorhereindescribed, consisting of the inclosing case, within which are the twosprings mounted upon and at opposite ends of the main shaft, thedriving-gear, the intermediate gearing, mounted upon shortcounter-shafting extending but part way across the case, thebalance-wheel,

and regulator, and in which the shafting is set on a horizontal lineator about midway between the top and bottom of the casing, substantiallyas shown and described.

2. The hook-brake R, the slotted wedge c, and button d, constructed andoperating substantially as described.

3. The V-shaped spring-brake S, arranged to engage with both sides of adriving or balance wheel near its periphery, and controlled by thepivoted wedge T, substantially as described.

4. The fanning device W, mounted upon a vertical arm,and operated by thedrivin gmechanism of a sewing-machine motor, substantially as described.

I GHAUNGEY F. G-REER.

Witnesses:

PHIL. F. LARNER, F. A. JACKSON.

